2640137525 has 12 divisors (see below), whose sum is σ = 3386660100. Its totient is φ = 2039278080.

The previous prime is 2640137503. The next prime is 2640137527. The reversal of 2640137525 is 5257310462.

It can be written as a sum of positive squares in 6 ways, for example, as 108638929 + 2531498596 = 10423^2 + 50314^2 .

It is not a de Polignac number, because 2640137525 - 2²⁴ = 2623360309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640137527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1820060 + ... + 1821509.

It is an arithmetic number, because the mean of its divisors is an integer number (282221675).

Almost surely, 2^2640137525 is an apocalyptic number.

2640137525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2640137525 is a deficient number, since it is larger than the sum of its proper divisors (746522575).

2640137525 is a wasteful number, since it uses less digits than its factorization.

2640137525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3641608 (or 3641603 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 2640137525 is about 51382.2685855734. The cubic root of 2640137525 is about 1382.1086444733.

Adding to 2640137525 its reverse (5257310462), we get a palindrome (7897447987).

The spelling of 2640137525 in words is "two billion, six hundred forty million, one hundred thirty-seven thousand, five hundred twenty-five".